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Horizonlooksatdarkenergy-themysteriousforcethatisunexpectedlycausingtheuniverse'sexpansiontospeedup.Theeffectsofdarkenergywerediscoveredin1998butphysicistsstilldon'tknowwhatitis.Worse,itsveryexistencecallsintoquestionAlbertEinstein'sgeneraltheoryofrelativity-thecornerstoneofmodernphysics.Thehuntfortheidentityofdarken...